Today is the day that the DeLorean would have landed in the "future" version of Hill Valley. Sadly, there are several problems. Our cars are still not flying and don't have Mr. Fusion's on them. There are no hoverboards, no double neck ties (thank God). No more Jaws sequels either. Also, Hill Valley, also known as the Universal Studios Hollywood Backlot, burned down a couple of years ago, though it has since been restored.
Elisabeth Shue, however, seems likely to sleep through most of the day, so at least that's accurate. What ever happened to her? The world needs more Shue.
And you can now buy the movie trilogy on Blu-Ray. That's technological progress.